Backtesting
NMRF framework: does it satisfy the ‘use test’?
Non-modellable risk factors affect risk sensitivity and face practical and calibration difficulties, argue two risk experts
Barclays logs five VAR breaches amid tariff turmoil
Bank’s regulatory VAR model loses green status for the first time since 2018
Double VAR breach in Q2 adds $4.1bn to JP Morgan’s market RWAs
Sixth regulatory backtesting exception in nine months lifts the multiplier above minimum for the first time since Q3 2022
Semiparametric GARCH models for value-at-risk and expected shortfall: an object-driven procedure
Basing their approach in object-drive smoothing, the authors calculate value-at-risk and expected shortfall via an application of semi-GARCH models.
US banks’ VAR shortfalls are wrapped in a black box
Public disclosures only allow crude approximations of loss size and timing
The VAR-centric models that never were
Often spotlighted, rarely dominant – VAR plays a surprisingly small role in most IMA stacks
Barclays takes selective approach to FRTB IMA applications
Risk Live: UK bank is applying for approval for parts of its portfolio most likely to pass approval tests
‘I feel like a guinea pig’ – lessons from an early IMA adopter
Risk Live: Nomura’s Epperlein urges flexible approach to backtesting exceptions
Overcoming issues with time-scaling value-at-risk
The authors investigate the impact of different time-scaling techniques on the accuracy of value-at- risk models, emphasising the importance of carefully scaling methods and considering alternative risk modeling approaches.
Gaussian GenAI: synthetic market data generation
A method to generate financial time series with mixture models is presented
JP Morgan’s VAR limits blown twice during haywire Q1
Breaches add to the two regulatory backtesting exceptions sustained the previous quarter
Tariff turbulence piles pressure on banks’ VAR models
Backtesting breaches start to mount, but too early to tell if regulatory intervention needed
Trading desks want regulators to face down the NMRF monster
Rule-makers in Australia and the European Union are open to changes to the unpopular FRTB test
UniCredit tops Europe’s VAR breach leaderboard in 2024
Swedbank, Commerzbank and SocGen among model users repeatedly blindsided by volatility
Market knee-jerks keep VAR models on their toes
With a return to volatility, increased backtesting exceptions show banks’ algos are stretched
US dealers tally most VAR breaches since mid-2023
Market turmoil in Q4 blindsides models at systemic and regional banks alike
Buffer stop: Eurex clearing members shunt default fund
Clearing house’s CRO says both members and clients opt to pay more margin instead
During Trump turbulence, value-at-risk may go pop
Trading risk models have been trained in quiet markets, and volatility is now looming
Dissecting initial margin forecasts: models, limitations and backtesting
The authors demonstrate that initial margin is not value-at-risk, but its approximation, and suggest a generic backtesting and verification framework that accommodates both forecasting limitations and existing models.
Goldman chalks up highest VAR breach since pandemic
Nine breaches in total across 34 banks in Q3
UBS logs three VAR breaches on legacy Credit Suisse positions
Bank risks higher capital charges amid market volatility and exit-related costs